Berlin 2024 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 21: Phd Focus Session: Altermagnets: Foundations and Experimental Evidence
MA 21.6: Vortrag
Mittwoch, 20. März 2024, 11:15–11:30, H 1058
Spontaneous formation of altermagnetism from orbital ordering — •Johannes Knolle1, Valentin Leeb1, Alexander Mook2, and Libor Smejkal2 — 1Technical University of Munich, TUM School of Natural Sciences, Physics Department, TQM, 85748 Garching, Germany — 2Institute of Physics, Johannes Gutenberg-University Mainz, Staudingerweg 7, Mainz 55128, Germany
Altermagnetism has emerged as a third type of collinear magnetism. In contrast to standard antiferromagnets, sublattices of anti-aligned spins are not connected by simple translations or inversion but require additional real-space rotations. Therefore, most proposals for materials realization concentrate on crystals that already have this low symmetry. Here, we show that altermagnetism can also form spontaneously as an interaction-induced electronic instability in a high symmetry crystal. We provide a microscopic example of a two orbital model showing that the coexistence of antiferromagnetic and orbital order realizes an altermagnetic phase. We quantify experimental observables like the spin conductivity and discuss possible material candidates with orbital ordering.
Keywords: Altermagnetism; Orbital Ordering; Electronic Correlations; Spin transport